For example. In the case of this set for Ultra Necrozma.
Necrozma-Ultra @ Ultranecrozium Z
IVs: 30 Def
EVs: 128 Atk / 128 SpA / 252 Spe
- Photon Geyser
- Dragon Pulse
- Calm Mind
In this case, its attack and special attack are identical (402 each to be specific). So, that being said, will Photon Geyser be a Physical attack, or a Special attack?